A space is kept at - 15oC by a vapor-compression refrigeration system in an ambient at -

Question:

A space is kept at - 15oC by a vapor-compression refrigeration system in an ambient at - 5oC. The space gains heat steadily at a rate of 3500 kJ/h and the rate of heat rejection in the condenser is 5500 kJ/h. Determine the power input, in kW, the COP of the cycle and the second-law efficiency of the system.